Sheila jogs to a store 72 m away in a time of 36 s. What is Sheila's average speed? 2.0 m/s
O 0.5 m/s
0 108 m/s
0 36 m/s

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?